oh no! Destroyed my admin account using USERMOD :(

[Gabriel M Dragffy]

Hi,
I wanted to add my default superuser to the nogroup group. I couldn't
find a gui tool in gnome so I read the man page of usermod. I ran the
command    $sudo usermod -Gnogroup gabe
I thought this would have added me to the group but it seems to have
removed all the other groups and now I can't do anything with my
computer. I still have a terminal open so I can run sudo for the next
fifteen minutes, and I'm going to set a root password. Could someone
please tell me the default groups that the superuser is in?
Then I will add my user back in. Please respond quickly!!

Gabe
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